Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9204d4fec3c640b…

MALICIOUS

PDF

86.5 KB Created: 2021-08-11 08:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 474ea8617224d4b1ce41b9166a66cd4a SHA-1: 14c0ae823b9738438eaca97e5e0561f042f7db2d SHA-256: d9204d4fec3c640b237ef9bbf28dd9029196bbaaa434c7ca9db5beb07b69317c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0d2ac5e72532a2eef9d6f7c3614ed0cc/16530351907.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a90u2e7lsu079trjfeojq3eft4/naxarogexisov.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/du1mk2su1o6q6mltq44p4apjeq/zasaziwefiguxo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865d10933c2---66998101754.pdfIn PDF document text
    • http://nstyapi.com/resimler/files/mumirunaxomogulizadibub.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748362a1574---77451262704.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9000bac6a7---79961014271.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210731_C15869EB8D34CC66.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/db282b9907ae45a8066401d9cea46b8c/ligumulisegiweti.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53dbe64774---pimodupotokafewutudosowu.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dodolakozogebokubu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/4756016487.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe871745b88---kulezubilogomix.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/torovesati.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/31524121694.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a648770149eaf817c9832d4baff1f333/gupaj.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/razukizujalawusogefajojub.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9a2d46d8---62687878867.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee117f678---tabebi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e654ba50b---niwer.pdfIn PDF document text
    • http://baby-daycare.com/uploads//files/202108042125291948.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6159dfab1---gerexo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/86111938577.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/22e54f6edbd31b71691173b97286637a/75318663669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hack+de+ropa+para+among+us+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 17856 bytes
SHA-256: 3268a57a9dc3e46323a13f371b1bfa8f3995e173489b8f7d1f5feddc8a0cef10
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 10896 bytes
SHA-256: af46d1809ea71ff10e330971b84b9d6fb9ae4692a99de4e02ffb32c9378b80e9

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